"""
@Project:p9_exe
@File:diedaiqi.py
@Author:郑凯乐
@Date:10:05
"""
class MyNumbers:
    def __iter__(self):
        self.a = 1
        return self

    def __next__(self):
        if self.a <=20:
            x = self.a
            self.a +=1
            return x
        else:
            raise StopIteration

myclass = MyNumbers()
myiter = iter(myclass)

print(next(myiter))

print(next(myiter))
for x in myiter:
    print(x)
